diff --git a/lib/units/device/plugins/install.js b/lib/units/device/plugins/install.js
index ad06cda8..65c4e832 100644
--- a/lib/units/device/plugins/install.js
+++ b/lib/units/device/plugins/install.js
@@ -161,14 +161,14 @@ module.exports = syrup.serial()
         .then(function() {
           push.send([
             channel
-          , reply.okay('success')
+          , reply.okay('INSTALL_SUCCEEDED')
           ])
         })
         .catch(Promise.TimeoutError, function(err) {
           log.error('Installation of package "%s" failed', pkg, err.stack)
           push.send([
             channel
-          , reply.fail('timeout')
+          , reply.fail('INSTALL_ERROR_TIMEOUT')
           ])
         })
         .catch(InstallationError, function(err) {
@@ -186,7 +186,7 @@ module.exports = syrup.serial()
           log.error('Installation of package "%s" failed', pkg, err.stack)
           push.send([
             channel
-          , reply.fail('fail')
+          , reply.fail('INSTALL_ERROR_UNKNOWN')
           ])
         })
     })
diff --git a/res/app/components/stf/install/install-error-filter.js b/res/app/components/stf/install/install-error-filter.js
index b68d2829..a226c66c 100644
--- a/res/app/components/stf/install/install-error-filter.js
+++ b/res/app/components/stf/install/install-error-filter.js
@@ -6,15 +6,9 @@ var responses = require('./response-codes.json')
 module.exports = function installErrorFilter(gettext) {
   return function (text) {
     switch (text) {
-      case 'fail_invalid_app_file':
-        return gettext('Uploaded file is not valid.')
-      case 'fail_download':
-        return gettext('Failed to download specified URL.')
-      case 'fail_invalid_url':
-        return gettext('The specified URL is invalid.')
-      case 'fail':
-        return gettext('Upload failed to due unknown error.')
-      case 'timeout':
+      case 'INSTALL_ERROR_UNKNOWN':
+        return gettext('Installation failed due to an unknown error.')
+      case 'INSTALL_ERROR_TIMEOUT':
         return gettext('Installation timed out.')
       default:
         return gettext(responses[text] || text)